How to deduplicate and compress data blocks locked by snapshot

[Chun_Chiang]

I need to clarify whether ONTAP can dedup and compress data blocks locked by snapshot.  Does below command

vol efficiency start -volume vol1 -vserver vs1 -scan-all -shared-blocks -snapshot-blocks

dedup and compress data blocks locked by snapshot ?

if not, does it mean snapshot blocks can not be deduplicated or compressed ?

Regards,

Chun Chiang

[chenguanghui · Accepted solution]

hello:

        by default,data compression skips data block shared by Data deduplication and data blocks that are locked by Snapshot copies,the following article be maybe help for you.

https://docs.netapp.com/zh-cn/ontap/volumes/run-efficiency-operations-manual-existing-data-task.html 

[Chun_Chiang]

According to the article, this command:

vol efficiency start -scan-old-data true -dedup true

can dedup existing data blocks which are locked by snapshot, right?